214 



the plants usually called agarics in being corky or woody instead 

 of fleshy. Many of the species are ver)' difficult because of the 

 wonderful variations they undergo, especially in the appearance 

 of the hymenium. 



Kkv to the Gknkra. 

 Context white. 



Surface glabrous, liymenium usually labyriiithiform. A. Ao.VRlCUS. 



Surface pubescent or hirsute. 



Hymenium at first labyrinthiform, soon becoming irpiciform. 



B. Cerrena. 

 Hymenium lamellate, not becoming iipiciforni. C. I.ENZITES. 



Context brown. 



Hymenophore sessile, furrows radiate. D. Gl.OF.OPHYl.l.UM 



Ilymenophore stipiiate, furrows concentric. E. CvcLOi'ORl'S. 



A. The Spkcucs ov Agaricus 



1. Tubes one to several millimeters in transverse diameter ; surface usually brown or 



discolored. 2. 



Tubes less than one millimeter in transverse diameter ; surface whiteor yellowish ; 



plants confmed to the southern states. /}. Aescii/i (Schw. ) Murr. 



2. Pileus thick, triangular, margin obtuse ; tubes large, daedaleoid, dissepiments 



obtuse ; context wood-colored ; plants abundant on oak and chestnut. 



.'/. tjiiiTcimts I.. 



Pileus thick, triangular, margin obtuse ; tubes large, daedaleoid, dissejtiments 

 obtuse ; context white ; ])lants rare on red cedar. A. Junipt'iiiiiis Murr. 



Pileus thin, applanate, multizonate, margin very acute ; hymenium poroid, dae- 

 daleoid or lamelloid, dissepiments acute. A. fon/ragosits (Itolt. ) Murr. 



B. The Stecies of Cerrena 



Surface hairy, hymenium soon splitting into numerous teeth ; plants very common on 

 dead deciduous wood. CdirnKi iiii{<o/or (Hull.) Murr. 



C. The Si'EciES oi Len/.iies 



Surface tomenlose, hymenium lamellate ; very common on dead wood. 



l.ctizitcs bctiiliiia ( L. ) Fr. 



D. The S)'Ern:s ok Gi.oeoi'hyi.i.u.m 



1. Context ferruginous to chestnut. 2. 



Context avellancous to umber, furrows only h:ilf a millimeter in width, surface 



usually azonate. C. pnllitiofulvutn ( Herk. ) Murr. 



2. Surface hirsute. (/. hiraulunt (Schaedf. ) Murr. 

 .Surface fmely lomentose or glabrous. G. I^crkeleyi ( Sacc. ) Murr. 



E. The Si-ecies oe Cvci.oroKus 

 A rare and remarkable plant, easily known by its concentrically furrowed hymenium 

 and central sti|)e. Cydoporus Grcctici (Herk.) Murr. 



New V'okk BoiAMfAi, Garden. 



